Son has moved into a 1880's terrace.
Rear of kitchen is extension that was probably toilet/washhouse etc with
single course brickwork.
Slight damp problem, suggested he seal extrenal brickwork with Aquaseal or
similar waterproofing/silicone? when
brickwork is dry. Put inside 4" stud partition with airspace top & bottom
lined with plasterboard.
Are there any special plasterboards or better? Any alternative/better
It's unlikely to be an extension, in that it was built with
the rest of the house -- very common.
It's not a very good idea to treat brickwork like this.
Check the pointing is in good condition and rainwater
gutters/pipework is working and not spewing water down
the wall. If that's OK, just assume that's as dry as
you will get the wall, and design the inner leaf to
4" seems excessive, and would result in a significant
loss of space in the room. I would use battens, probably
made from pressure treated roofing battens. Look up your
local roofing supplier and see what their largest roofing
batten size is, for a suitable candidate.
Use plasterboard with integral Kingspan/cellotex backing,
which will prevent the wall being cold and forming damp
from condensation. The ventilation behind should be to the
outside, not the inside. Use pressure treated timber for
the battens/studding, and I would suggest a strip of
plastic (e.g. damp proof membrane) between each batten
and the wall where they are in contact, so the timber is
not kept damp by contact with the outside wall. Also use
a strip along the floor under the plasterboard, in case
the floor is damp (quite likely).
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